Video Output setting reset?

Nope - no joy. Set it to HDMI Auto and match video framerate. The movie - a rendering of “The Odd Couple” with Jack Lemmon and Walter Matthau - starts with a night time city shot. You can see a bus moving through the scene and then Jack Lemmon walking down the street. And it’s like you’re watching him frame by frame or as a quick succession of stills. Switch to a forced resolution of 1080p at 60hz, and suddenly his movements are smooth as silk. So going “HDMI Auto” is not an option, alas.